package org.eoti.elec;

/**
 * The MIT License
 * <p/>
 * Copyright (c) 2009 Malachi de AElfweald (malachid@gmail.com)
 * <p/>
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * <p/>
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
 * Software.
 * <p/>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
import org.eoti.util.TimeUtil;

import java.util.concurrent.*;

public class TickGenerator
extends Thread
{
	protected CopyOnWriteArrayList<TickListener> listeners;
	protected boolean done = false;

	protected static TickGenerator singleton;
	public static TickGenerator getInstance()
	{
		if(singleton == null)
			singleton = new TickGenerator();

		return singleton;
	}
	protected TickGenerator()
	{
		super("TickGenerator");
		listeners = new CopyOnWriteArrayList<TickListener>();
		this.start();
	}

	public void addTickListener(TickListener listener)
	{
		listeners.add(listener);
	}

	public void removeTickListener(TickListener listener)
	{
		listeners.remove(listener);
	}

	public void turnOff()
	{
		done = true;
	}

	public void run()
	{
		while(!done)
		{
			for(TickListener listener : listeners)
				listener.tick();

			TimeUtil.Nanosecond.sleep(3); // don't throttle CPU
		}
	}

}
